Configuring VHDL Reserved Words

The VHDL Language Reference Manual (LRM) has a section listed reserved words. The use of these words are restricted in identifiers and names.

There are rules which can check for use of reserved words where they should not be used. These rules provide the following options:

Option	Values	Default Value	Description
`standard`	`1987`, `1993`, `2000`, `2002`, `2008`, `2019`	`all`	`1987` = Use reserved keywords from 1987 standard `1993` = Use reserved keywords from 1993 standard `2000` = Use reserved keywords from 2000 standard `2002` = Use reserved keywords from 2002 standard `2008` = Use reserved keywords from 2008 standard `2019` = Use reserved keywords from 2019 standard `all` = Use reserved keywords from all standards

This is an example of how to configure these options.

rule :
  reserved_001:
     standard: 'all'

Note

The following examples are using rule reserved_001.

Example: `standard` set to `1987`

The null keyword is a reserved word in the 1987 standard.

Violation

entity null is
end entity;

The rol keyword is a reserved word in the 1993 standard.

Violation

entity rol is
end entity;

The context keyword is a reserved word in the 2008 standard.

Violation

entity context is
end entity;

The private keyword is a reserved word in the 2019 standard.

Violation

entity private is
end entity;